JP2004167644A - Method and apparatus for polishing squeegee used for screen printing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for polishing a urethane-rubber-made squeegee by which the generation of a burr on an edge is suppressed. <P>SOLUTION: The polishing apparatus has an abrasive wheel head 15 including an abrasive wheel 171 for grinding the surface of the squeegee. The abrasive wheel head includes a first trestle 150 and a second trestle 160 wherein the first trestle can reciprocate in parallel with the set squeegee and the second trestle can move orthogonally to the moving direction of the first trestle. The abrasive wheel is provided on the second trestle, and a grinding operation is performed while the wheel is moved in zigzag so as to suppress the generation of the burr on the edge of the squeegee. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method and an apparatus for polishing a squeegee used for screen printing, and more particularly to a method and an apparatus for removing burrs generated while suppressing burrs as much as possible.
[0002]
[Prior art]
In screen printing, when printing is performed using a urethane rubber squeegee, the edges (corners) that come into contact with the ink and the plate need to be polished before use because they require linearity and sharpness. In addition, as the printing is repeatedly performed, the linearity and sharpness are impaired due to scratches and wear. In this case, the edge is polished again before use. Generally, the end surface of a squeegee is polished with a rotating grindstone. However, since the cutting powder of urethane rubber is soft and sticky, burrs (fine shavings) are likely to remain on the edges. Was.
[0003]
If printing is performed with the burrs remaining on the edges, streaks are noticeable in the stroke direction, and good printing cannot be performed. Currently, in order to remove burrs generated on the edge of the squeegee, workers wrap sandpaper around their fingers and drop them with a light stroke, but since the removal of burrs is a manual operation, the sensation of a delicate fingertip Since skill is required, there is a problem that the finishing accuracy varies depending on the operator.
[0004]
Hitherto, a polishing apparatus for mechanically polishing a squeegee has been proposed, and is also proposed in Japanese Patent Application Laid-Open No. 8-1501.
[0005]
The proposed device prepares two types of rotating grinding wheels, a first grinding wheel with a coarse grinding wheel and a second grinding wheel with a fine grinding wheel, and first grinds it with the first grinding wheel. The polishing is performed by switching from the second grinding stone to the second grinding stone, and is intended to prevent clogging of the grinding stone, particularly clogging of the second grinding stone by a fine grinding wheel. A polishing apparatus for removing or suppressing generation of burrs has not been developed.
[0006]
[Problems to be solved by the invention]
The problem to be solved by the present invention is to provide a polishing method and apparatus for minimizing burrs generated on an edge when polishing a squeegee made of urethane rubber or the like. It is an object of the present invention to provide a polishing method and a polishing apparatus for removing a burr.
[0007]
[Means for Solving the Problems]
The solution includes a grinding wheel head provided with a grinding wheel for grinding a squeegee surface, the grinding wheel head includes a first gantry and a second gantry, and the first gantry is provided so as to be capable of reciprocating movement. The gantry 2 is provided so as to be able to reciprocate in a direction orthogonal to the moving direction of the first gantry, a squeegee is installed in parallel with the moving direction of the grinding wheel head, and a grinding wheel is provided on the second gantry. The grinding operation is performed while moving the grinding wheel in the zigzag direction to suppress the occurrence of burrs on the edge of the squeegee.
Another solution is to provide a grindstone head with a grindstone wheel for grinding the squeegee surface, provide the grindstone head reciprocally, and install the squeegee parallel to the reciprocating direction of the grindstone head. A deburring member that reciprocates toward the edge of the squeegee is provided, and after the grinding operation by the grinding wheel is completed, the deburring member is moved forward to reciprocate the grindstone head while being in contact with the edge of the squeegee. It is characterized in that the deburred is removed, and the deburring member is sandpaper.
[0008]
Means for solving the problem include a grinding wheel head provided with a grinding wheel for grinding a squeegee surface, wherein the grinding wheel head includes a first gantry and a second gantry, and the first gantry is provided so as to be able to reciprocate by reciprocating means. The second gantry is provided so as to be able to reciprocate by reciprocating means in a direction orthogonal to the direction of movement of the first gantry, and a squeegee is installed in parallel to the direction of movement of the grinding wheel head. The grinding wheel is provided on the second gantry so as to be movable up and down, and the grinding wheel is moved in a zigzag direction.
Another solution has a grinding wheel head provided with a grinding wheel for grinding a squeegee surface, a grinding wheel head is provided so as to be able to reciprocate, a squeegee is installed in parallel to the moving direction of the grinding wheel head, and the grinding wheel head is mounted on the grinding wheel head. A grinding wheel provided with a deburring member installed and reciprocated toward the edge of the squeegee by reciprocating means, and pressing means for maintaining the contact state by an appropriate pressing force even after the deburring member comes into contact with the edge of the squeegee; After the grinding operation is completed, the deburring member is advanced to reciprocate the grindstone head while being in contact with the edge of the squeegee, and the deburring member is sandpaper.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
1 is a side view showing a main part of the apparatus of the present invention, FIG. 2 is a sectional view of the same, FIG. 3 is a front view of the entire apparatus with a part thereof omitted, FIG. 4 is a plan view of the same, and FIG. , A is a plan view, B is a side view, FIG. 6 is a perspective view showing a squeegee mounted on a holder, and FIG. 7 is a perspective view showing a squeegee having burrs on edges.
[0010]
In FIG. 6, a squeegee 1 is formed of a slender plate using urethane rubber or the like, and is mounted on a squeegee holder 2. The end surface of the squeegee 1 is polished by a grinding wheel. However, as shown in FIG. 7, when polished, burrs 1a may be generated on the edges. The squeegee holder 2 has two holder members 2 a and 2 b sandwiching about half of the squeegee 1 in the longitudinal direction and tightened by the lock nut 3.
[0011]
1 to 4, a polishing apparatus 10 has a body 11 having fixed legs 12 and casters 13, and the polishing apparatus 10 can be installed at an arbitrary place. The machine body 11 is provided with two parallel first rails 14, and the first rail 14 is provided with a grindstone head 15 movably. A grinding wheel head 15 including a grinding wheel (171), which will be described in detail later, slides on a first rail 14 and can move in a direction parallel to the first rail 14; A second gantry 160 provided on one gantry 150 and movable in a direction orthogonal to the moving direction of the first gantry 150; and a second gantry 160 provided on the second gantry 160 and movable in a vertical direction. It has a third gantry 170.
[0012]
The body 11 of the polishing apparatus 10 is provided with a gantry transport belt 21 attached to the pulleys 20 and 20a and rotating endlessly in parallel with the first rail 14 at a position below the first gantry 150. The drive shaft 23 of the first drive motor 22 is coupled to the drive pulley 20 of the two pulleys. In addition, the first mount 150 is provided with a first connection metal 151 extending downward, and the first connection metal 151 is connected to the gantry transport belt 21. Accordingly, when the first drive motor 22 is driven, the pulley 20 rotates together with the drive shaft 23 and the gantry transport belt 21 simultaneously rotates. Therefore, the gantry transport is performed by operating the first drive motor 22 in the forward and reverse directions. The first gantry 150 (the entire grindstone head 15) coupled to the belt 21 via the first connection fitting 151 reciprocates on the first rail 14. Note that the gantry transport belt 21 is preferably a belt capable of obtaining a fine feed amount like a timing belt.
[0013]
A second rail 152 is provided on the upper surface of the first gantry 150 in a direction orthogonal to the longitudinal direction of the first rail 14, and the second gantry 160 is movable on the second rail 152. It is provided in. A second drive motor 153 is provided on the lower surface of the first base 150, and a screw shaft 154 of the second drive motor 153 is arranged in a direction orthogonal to the longitudinal direction of the first rail 14, that is, in a second direction. Are provided in a direction parallel to the rail 152. Further, a second connection fitting 161 is provided on the lower surface of the second base 160 so as to penetrate the hole 155 formed in the first base 150 and extend downward. The screw shaft 154 of the second drive motor 153 is connected. Thus, when the second drive motor 153 is driven to rotate the screw shaft 154, the second base 160 connected via the second connection fitting 161 reciprocates in a direction orthogonal to the first rail 14. Moving.
[0014]
A third drive motor 162 is provided on the upper surface of the second mount 160, and the screw shaft 163 of the third drive motor 162 reciprocates the third mount 170 in the vertical direction. Since the screw shaft 163 of the third drive motor 162 is connected to the third mount 170, when the third drive motor 163 is driven to rotate the screw shaft 163, the third mount 170 is moved up and down. Go to Note that a plurality of guide columns 164 are provided on the lower surface of the third mount 170 in parallel with the operation direction of the third drive motor 162, and the guide columns 164 are guide cylinders provided on the second mount 160. 165 is slidably accommodated.
[0015]
If both the second and third drive motors 153 and 162 are drive motors with a reduction gear, each of the screw shafts 154 and 163 can reciprocate minutely.
[0016]
Further, a grinding wheel 171 is provided on the upper surface of the third gantry 170. The rotation shaft 172 of the grinding wheel 171 is provided on a bearing body 173 provided on the upper surface of the third gantry 170 in a direction orthogonal to the length of the first rail 14 and protrudes toward the front of the machine body 11. The grinding wheel 171 is fixed to a portion (the left end in FIGS. 1 and 2). A pulley 174 is provided on the rotation shaft 172 in a direction opposite to the grinding wheel 171, and the pulley 174 is connected to a drive pulley 176 of a fourth drive motor 175 provided on the upper surface of the bearing body 173 by a belt 177. ing. When the fourth drive motor 175 is driven, the rotational force is transmitted to the rotary shaft 172 via the drive pulley 176, the belt 177, and the pulley 174, and the grinding wheel 171 rotates in front of the body 11 with the rotation of the rotary shaft 172. I do.
[0017]
The squeegee 1 is mounted on a squeegee holder 2 and attached to the body 11 so that the squeegee 1 faces upward. A squeegee holder 2 that allows the squeegee holder 2 to be installed in a direction parallel to the moving direction of the grinding wheel head 15 and directly below the grinding wheel 171 is provided on the front of the machine body 11. The squeegee holder 2 is mounted facing upward, and is fixed by a piston rod 32 of a holder press-fitting cylinder 31 which is operated by fluid pressure. It should be noted that a plurality of holder crimping cylinders 31 are provided, and as shown in FIGS. 3 and 4, one squeegee holder 2 is mounted on each cylinder mounting board 33 provided on the body 11. It acts in the direction of pressing against 11.
[0018]
As shown in FIGS. 1 and 5, the deburring device 40 of the present invention is provided on a side plate 41 which is a part of the grindstone head 15 and moves forward and backward toward the edge of the squeegee 1 set on the machine body 11. Shown as member 42. A mounting plate 43 is fixed to the side plate 41 by bolts 44 so that the mounting angle can be changed. The mounting plate 43 is located above the squeegee 1 set on the holder mounting step 30 on the mounting plate 43 and has a 45 ° angle with respect to a vertical line. A deburring member pressing cylinder 45 set at an inclination angle is provided. Further, a piston rod 46 of the deburring member pressing cylinder 45 projects from both ends of the cylinder, and a mounting base 47 for the deburring member 42 is provided at a portion facing the squeegee 1. A stroke adjusting nut 49 for controlling the amount of protrusion of the rod 46 is provided. The mounting pedestal 47 is provided with a plurality of guide rods 50, and the guide rods 50 are slidably accommodated in guide cylinders 51 provided on the mounting plate 43.
[0019]
The piston rod 46 of the deburring member pressing cylinder 45 has a mounting pedestal 47 at the tip thereof. A flange 52 is formed at the tip of the piston rod 46, and a recess formed in the mounting pedestal 47 together with the flange 52. It is freely inserted into the hole. The piston rod 46 is provided with a stopper plate 53 between the mounting plate 43 and the mounting pedestal 47, and a coil spring 54 is mounted between the stopper plate 53 and the mounting pedestal 47. Further, a flange plate 55 extending toward both ends is formed on the mounting base 47, and a sandpaper 56 covering the surface of the mounting base 47 is fixed to the flange plate 55 by a sandpaper clip 57. The deburring member 42 moves forward by the action of the deburring member pressing cylinder 45 and comes into contact with the edge of the squeegee 1. The contact is maintained while maintaining the pressing force.
[0020]
3 and 4, the grinding wheel 171 is provided with a grinding wheel cover 60, and the grinding wheel cover 60 is further provided with a dust collection hose 61 for collecting chips generated during polishing. Is prevented from scattering around the polishing apparatus.
[0021]
The embodiment is as described above. The squeegee 1 to be polished is fixed to the squeegee holder 2 and then mounted on the holder mounting step 30 of the machine body 11, and the moving direction of the grinding head 15 by the piston rod 32 of the holder press-fit cylinder 31. Install in a direction parallel to. Next, the third mount 170 is lowered by the third drive motor 162 to determine the grinding depth of the grinding wheel 171. When the above preparation is completed, the fourth drive motor 175 is driven to rotate the grinding wheel 171, and further, the first drive motor 22 is driven to rotate the gantry transport belt 21 to move the grinding wheel head 15 to the second position. At the same time as moving along the first rail 14, the second drive motor 153 is driven to move the second gantry 160 in a direction orthogonal to the first rail 14.
[0022]
The surface of the squeegee 1 is polished by the rotating grinding wheel 171. Since the amount of grinding of the squeegee is determined by the descending amount of the grinding wheel 171, the descending amount of the grinding wheel 171 and the number of reciprocations of the grinding wheel head 15 are set for each reciprocation. The reciprocating movement amount of the gantry 160 is set.
[0023]
When the grindstone head 15 reciprocates, the second gantry 160 slightly moves in the orthogonal direction, so that the grindstone wheel 171 moves in the zigzag direction on the surface of the squeegee 1. Here, the cutting force of the grinding wheel 171 is such that the rotational tangential force of the grinding wheel and the force at right angles to the squeegee act obliquely on the squeegee, so that the burr can be cut well and the linearity and sharpness are improved. In addition, since the process of suppressing the generation of burrs can be performed during the polishing cycle, the productivity is also improved.
[0024]
In the experiment of the inventor, the generation of burrs was most suppressed when the grinding wheel was moved about 0.5 mm in a direction perpendicular to the moving distance of the grinding head 100 mm in a zigzag travel.
[0025]
After the grinding operation is completed by moving the grindstone head 15 the set number of reciprocations, the grinding wheel 171 rotates only without descending and performs only reciprocating movement to perform finish grinding. Although the finish grinding is performed to remove burrs, burrs are likely to be generated at the edges. After the grinding by the grinding wheel 171 is completed, the third gantry 170 is raised to move the grinding wheel 171 to the squeegee 1. , And the deburring device 40 is operated here.
[0026]
The deburring device 40 adjusts the position of a stroke adjusting nut 49 provided on the piston rod 46 of the deburring member pressing cylinder 45 to set the amount of projection of the piston rod 46. When the grinding wheel 171 retreats from the edge, the piston rod 46 is protruded by the deburring member pressing cylinder 45, and the sandpaper 56 constituting the deburring member 42 is brought into contact with the edge of the squeegee 1 as shown in FIG. The grindstone head 15 is reciprocated as it is to remove burrs remaining on the edge. At this time, since the sandpaper 56 is in contact with the edge by the elasticity of the coil spring 54, it is possible to reproduce an operation in which the worker wraps the sandpaper around the finger and strokes the edge.
[0027]
【The invention's effect】
The present invention relates to a polishing apparatus in which a grinding wheel head provided with a grinding wheel for grinding a squeegee surface is capable of reciprocatingly moving, wherein the grinding wheel head comprises a first gantry and a second gantry, and the first gantry can be reciprocated. Since the second gantry is provided on the first gantry so as to be movable in a direction orthogonal to the moving direction of the first gantry, and the grinding wheel is provided on the second gantry so as to be vertically movable. By performing the grinding operation while moving the grinding wheel in the zigzag direction, burrs generated on the squeegee can be suppressed as much as possible. Is also improved.
[0028]
Further, the present invention provides a polishing apparatus in which a grinding wheel head provided with a grinding wheel for grinding a squeegee surface is provided with a deburring member which reciprocates toward an edge of a squeegee in a polishing apparatus capable of reciprocating. When the grindstone head is reciprocated while pressing the deburring means against the edge after the grinding operation is completed, the burr generated on the edge can be automatically removed, and when the deburring means is formed of sandpaper. Can reproduce the same work as a worker wrapping and rubbing sandpaper around his finger, so that there is no variation in finish accuracy.
[Brief description of the drawings]
FIG. 1 is an overall side view showing a main part of a device of the present invention.
FIG. 2 is a sectional view of FIG.
FIG. 3 is a front view of the entire apparatus with a part omitted.
FIG. 4 is a plan view of FIG. 3;
5A and 5B show a deburring apparatus, wherein A is a plan view and B is a side view.
FIG. 6 is a perspective view showing a squeegee mounted on the holder.
FIG. 7 is a perspective view showing a squeegee in which burrs are generated on an edge.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 squeegee 2 squeegee holder 3 lock nut 10 polishing device 11 body 12 fixed leg 13 caster 14 first rail 15 grinding wheel head 150 first gantry 151 first connection fitting 152 second rail 153 second drive motor 154 Screw shaft 155 Air hole 160 Second mount 161 Second connection fitting 162 Third drive motor 163 Screw shaft 164 Guide column 165 Guide cylinder 170 Third mount 171 Grinding wheel 172 Rotating shaft 173 Bearing 174 Pulley 175 4 drive motor 176 drive pulley 177 belt 20 pulley 21 gantry transport belt 22 first drive motor 23 drive shaft 30 holder mounting step 31 holder pressing cylinder 32 piston rod 33 cylinder mounting substrate 40 deburring device 41 side plate 42 deburring member 43 mounting plate 44 mounting bolt 45 Deburring member pressing cylinder 46 Piston rod 47 Mounting base 48 Clamp nut 49 Stroke adjusting nut 50 Guide rod 51 Guide cylinder 52 Flange 53 Stopper plate 54 Coil spring 55 Flange plate 56 Sandpaper 57 Sandpaper clip 60 Grinding stone cover 61 Dust collection hose

Claims (6)

A grinding wheel having a grinding wheel for grinding a squeegee surface, wherein the grinding wheel head (15) includes a first gantry (150) and a second gantry (160), and the first gantry is reciprocally movable; The second gantry is provided so as to be able to reciprocate in a direction orthogonal to the moving direction of the first gantry, a squeegee is installed parallel to the moving direction of the grinding wheel head, and the grinding wheel is moved to the second direction. 2. A squeegee polishing method used for screen printing, wherein a grinding operation is performed while the grinding wheel is moved in a zigzag direction while being mounted on a gantry of No. 2 to suppress generation of burrs on edges of the squeegee. A grinding wheel head provided with a grinding wheel for grinding a squeegee surface; a grinding wheel head (15) provided so as to be reciprocable; a squeegee installed in parallel to a moving direction of the grinding wheel head; A deburring member (42) is provided which reciprocates toward the edge of the squeegee. After the grinding operation by the grinding wheel is completed, the deburring member is advanced to reciprocate the whetstone head while being in contact with the edge of the squeegee. A squeegee polishing method used for screen printing, wherein burrs are removed. The squeegee polishing method according to claim 2, wherein the deburring member (42) is sandpaper. A grinding wheel head provided with a grinding wheel for grinding a squeegee surface, wherein the grinding wheel head (15) includes a first gantry (150) and a second gantry (160), and the first gantry is a reciprocating means ( 21, 151) so that the squeegee can be reciprocated by the reciprocating means (153, 155) in a direction orthogonal to the moving direction of the first gantry. A squeegee polishing apparatus for use in screen printing, wherein the grinding wheel is installed in parallel with the moving direction of the grinding wheel head, a grinding wheel is provided on the second gantry so as to be vertically movable, and the grinding wheel is moved in a zigzag direction. A grindstone head provided with a grindstone wheel for grinding the squeegee surface is provided. A grindstone head (15) is provided so as to be able to reciprocate. A squeegee is set in parallel to the moving direction of the grindstone head. A deburring member (42) reciprocating toward the edge of the squeegee by the moving means (45); and pressing means (54) for maintaining the contact state by an appropriate pressing force even after the deburring member comes into contact with the edge of the squeegee. ), And after the grinding operation by the grinding wheel is completed, the deburring member is advanced to reciprocate the grinding wheel head while being in contact with the edge of the squeegee. The squeegee polishing apparatus according to claim 5, wherein the deburring member (42) is sandpaper.

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